About datalist in xml webservice

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C#

aoa i want to make datalist in xml webservice how can it be possible how can i will make ... as i am making datalist on json webservice through datacaltract and datamember like this:

public List<datalist2> getcurrency()
       {
           SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["bcountsdb"].ConnectionString);
           con.Open();
           SqlCommand cmd = new SqlCommand("Select *  from SysCurrency ", con);
           SqlDataReader rdr = cmd.ExecuteReader();
           List<datalist2> data = new List<datalist2>();
           if (rdr.HasRows)
           {
               while (rdr.Read())
                   data.Add(new datalist2(rdr.GetString(0), rdr.GetString(1)));
           }
           con.Close();
           return data;
       }

[DataContract]
  public class datalist2
  {
      [DataMember]
      public string val1 { get; set; }
      [DataMember]
      public string val2 { get; set; }
       public datalist2(string v1, string v2)
      {
          val1 = v1;
          val2 = v2;
      }
  }

how it can be done in xml format?